Slider box assembly for warp knitting machines



Feb. 26, 1957 SLIDER BOX ASSEMBLY FOR WARP KNITTING MACHINES H. c. NOE 2,782,617

Filed Aug. 17, 1955 INVENTOR E United States atent SLIDER BOX ASSEMBLY FOR MACHINES WARP KNITTING Harold C. Noe, Upper Montclair, N. J., assignor to Kidd-e Manufacturing C0., Inc., tion of Delaware Bloomfield, N. 5., a corpora- Applicatiou August 17, 1955, Serial No. 529,054 12 Claims. (CI. 66-86) The present invention relates to chines and the like,

Warp knitting maand, more'particularly, to an improved slider box assembly including the pusher bars which are operated by the pattern mechanism to impart endwise movement to the guide bars The pattern mechanism of Raschel chines, for example, comprising a of such machines. warp knitting madrum, chain links passing over the drum, and a slide box including pusher a pusher pad at the other end for engaging the pusher rod at one end of the guide bars. The chain links have cam surfaces for effecting endwise movement of the pusher bars and guide bars in one direction and a strong return spring capable of exerting a force of between about 50 and 100 pounds guide bars to pull the guide bars in th and thereby urge the cause the pusher bar rollers to follow the pattern chain links.

In order to effect the is connected to the e opposite direction pusher bars in that direction to the cam surface of desired endwise movement or" the guide bars during the knitting cycle, the cam surfaces of the chain links bars in several positions.

vary in height to place the guide Presently, particularly in connection with so called high speed Raschel machines, it

is contemplated to provide certain ii of increasing height to move the guide tion to a desired position, a surface maintaining the nits with a surface bars in one direcof fixed height for to drop off onto a succeeding link surface ofles'ser height whereby the return spring moves the in the opposite directio In the operation of such a guide bars rapidly pattern mechanism, the

strong return'spring imparts considerable kinetic energy tothe bar assembly as the roller drops oflf thereby causpact. guide bars return from one extreme position to the other extreme position, and, in'some cases, causes the bars to rebound and be pass between adjacent needles which of these elements. Such impact also I quently necessary.

ofi gauge as thethread guides results in breakage oosens up theguide Accordingly, an object of the 'present invention isto provide a slider box assembly or. the

ting machines-which and disadvantages.

Another. object is to provide such like for warp kniteliminates the foregoing difiiculties an assembly which damps impact without reducing the speed of the machine and permits safe operation of the machine at even higher speeds than heretofore attained.

Another object is to provide such an assembly having means for accurately taining a desired damping effect.

Another object is to provide such can be easily installed on either ne and reliably adjusting and mainan assembly which wly constructed or 2,782,617 Patented Feb. 26, 1957 existing machines equipped with either pattern chain links or a pattern wheel.

A further object is to provide such an assembly Which is simple and economical in construction and does not require frequent service or maintenance.

Other and further objects of the invention will be obvious upon an understanding of the illustrative embodione skilled in the art upon employment of the invention in practice.

A preferred embodiment of the invention has been chosen for purposes of illustration and description, and is shown in the accompanying drawing, forming a part of the specification, wherein the single figure is a fragientary elevational view, partly in section, of a portion of a warp knitting machine embodying the present invention.

guide bar 19,

The end of the pusher bar 16 at the right, as viewed, carnes a bracket is engaged by and wheel (not shown). carries a bracket 29 having a pusher pad 30 ment with the pusher rod 22 and having a depending leg section 31, the purpose of Which is about to be described.

for controlling the flow of fluid between the r the cylinder.

into an aperture extending from the underside of the casing to the cylinder.

In order to provide the desired damping efiect, which is dictated by the return spring load and the length of the return movement of the pusher bar in the knitting cycle, without adversely affecting the timing of the knitting elements the needle valve is accurately adjustable. This is accomplished by supporting the needle on a screw 45 threaded into an aperture likewise extending from the underside of the casing section to the cylinder near its closed end.

In operation, when a rise in the cam surface of the pattern control device moves the pusher bar towards the left, as viewed, the plunger moves with the pusher bar and in being retracted from the cylinder creates a suction effect, whereby fluid in the reservoir unseats the ball 40 and enters the cylinder 35 through the inlet port 37. When the pusher bar in following the cam surface drops off and is permitted to move rapidly towards the right as viewed, the plunger in being moved into the cylinder creates a compression effect, whereby the ball is seated across the inlet port and fluid bleeds from the cylinder to the reservoir by way of the outlet port 39. The return flow of the fluid is retarded by the needle 4'2 just sufliciently to dissipate the impact which would otherwise occur when the roller again contacts the cam surface.

' From the foregoing description it will be seen that the present invention provides a simple and practical manner of absorbing impact on the pattern cam surfaces to per mit high speed operation of the machine without damage to parts thereof and without impairing the timing of the knitting elements.

As various changes may be made in the form, construction and arrangement of the parts herein, without depart ing from the spirit and scope of the invention and without sacrificing any of its advantages, it is to be understood that all matter herein is to be interpreted as illustrative and not in any limiting sense.

I claim:

1. A slider box assembly for warp knitting machines comprising a pusher bar having an end adapted to be engaged by pattern cams and having another end for effecting movement of a guide bar, a casing having bearing means for slidably supporting said pusher bar with its ends disposed outwardly thereof, and shock absorber means operatively associated with said pusher bar and said casing for damping the movement of said pusher bar towards the pattern cams.

2. A slider box assembly according to claim 1, Wherein said shock absorber means includes a dashpot cylinder on said casing and a plunger extending into said cylinder and being mounted on the guide bar engaging end of said pusher bar.

3. A slider box assembly according to claim 2, wherein said casing has a reservoir for hydraulic fluid and valve means provide fluid flow communication between said reservoir and said cylinder.

4. A slider box assembly according to claim 3, wherein said valve means include a check valve for admitting hydraulic fluid into said cylinder from said reservoir and a bleed valve for controlling the flow of hydraulic fluid from said cylinder into said reservoir.

5. A slider box assembly according to claim 4, wherein said bleed valve is constructed and arranged to render the same adjustable.

6. A slider box assembly for warp knitting machines comprising a pusher bar; means on one end of said pusher bar adapted to be engaged by pattern earns; a bracket on the other end of said pusher bar including a pusher pad for effecting movement of a guide bar; a casing having bearing means for slidably supporting said pusher bar with its ends disposed outwardly thereof, a reservoir for hydraulic fluid beneath said bearing means and a dashpot cylinder beneath said reservoir extending in the direction of movement of said pusher bar; valve means providing fluid flow communication between said reservoir and said cylinder; and a plunger carried by said bracket extending into said cylinder.

7. A slider box assembly according to claim 6, wherein said valve means include a spring urged check valve for admitting hydraulic fluid into said cylinder from said reservoir upon movement of said plunger outwardly with respect to said cylinder having spring supporting member threaded into the underside of said casing adjacent said cylinder.

8. A slider box assembly according to claim 6, wherein said valve means include a bleed valve for controlling the flow of hydraulic fluid from said cylinder having an adjusting member threaded into the underside of said casing adjacent said cylinder.

9. In a warp knitting machine, the combination of a slidably supported guide bar, a slidably mounted pusher bar having means at one end adapted to be engaged by pattern cams to impart endwise movement thereto and having means at the other end thereof for engaging one end of said guide bar and effecting endwise movement of said guide bar in response to the movement imparted thereto by the pattern earns, a return spring for urging said guide bar against said pusher bar and said pusher bar towards the pattern cams, and shock absorber means including a plunger carried by said pusher bar for damping the movement of said pusher bar imparted thereto by the action of said spring.

l0. in a warp knitting machine, the combination of a slidably supported guide bar having a pusher rod at one end thereof, a slidably mounted pusher bar having means at one end adapted to be engaged by pattern cams to impart endwise movement thereto and having a pusher pad at the other end thereof for engaging said pusher rod and effecting endwise movement of said guide bar in response to the movement imparted to said pusher bar by the pattern earns, a return spring connected to said guide bar for urging said pusher rod against said pusher pad and said pusher bar towards the pattern cam, and shock absorber means including a plunger carried by said pusher bar at the pusher pad end thereof for damping the movement of said pusher bar imparted thereto by the action of said spring.

11. *In a warp knitting machine, the combination of a guide bar, means for slidably supporting said guide bar, a member adapted to be engaged by pattern earns for slidably moving said guide bar in one direction, a return spring for said guide bar and shock absorber means operatively associated with said member for damping the movement of said guide bar when under the influence of said return spring.

12. A warp knitting machine according to claim 11, wherein said shock absorber means include a plunger on said member a fixed dashpot cylinder for receiving said plunger, a reservoir for hydraulic fluid and valve means providing fluid flow communication between said reservoir and said cylinder.

References Cited in the file of this patent UNITED STATES PATENTS 2,155,145 Morton et al. Apr. 18, 1939 tuba- 

